Briefly describe the role of the bottom blowing of the re-blowing in the process of converter smelting

(1) Increase the pre-mixing, accelerate the melting of scrap steel, improve the smelting reaction, and facilitate the formation of early slag;

(2) Make the blowing process more balanced, reduce splashing, and improve the metal yield;

(3) In the later stage, the C-O reaction can be balanced, the oxygen content in the steel can be reduced, and the ultra-low carbon steel can be blown.